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1212221 is a prime number
BaseRepresentation
bin100100111111100111101
32021120212002
410213330331
5302242341
641552045
713206113
oct4477475
92246762
101212221
1175883a
124a5625
133359ba
14237ab3
1518e29b
hex127f3d

1212221 has 2 divisors, whose sum is σ = 1212222. Its totient is φ = 1212220.

The previous prime is 1212199. The next prime is 1212227. The reversal of 1212221 is 1222121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1060900 + 151321 = 1030^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212221 - 214 = 1195837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606110 + 606111.

It is an arithmetic number, because the mean of its divisors is an integer number (606111).

21212221 is an apocalyptic number.

It is an amenable number.

1212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212221 is an equidigital number, since it uses as much as digits as its factorization.

1212221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16, while the sum is 11.

The square root of 1212221 is about 1101.0090826147. The cubic root of 1212221 is about 106.6253822438.

Adding to 1212221 its reverse (1222121), we get a palindrome (2434342).

The spelling of 1212221 in words is "one million, two hundred twelve thousand, two hundred twenty-one".